CVE-2026-22851

FreeRDP is a free implementation of the Remote Desktop Protocol. Prior to 3.20.1, a race condition between the RDPGFX dynamic virtual channel thread and the SDL render thread leads to a heap use-after-free. Specifically, an escaped pointer to sdl->primary (SDL_Surface) is accessed after it has been freed during RDPGFX ResetGraphics handling. This vulnerability is fixed in 3.20.1.

• https://github.com/FreeRDP/FreeRDP/releases/tag/3.20.1

  security-advisories@github.com
• https://github.com/FreeRDP/FreeRDP/security/advisories/GHSA-8g87-6pvc-wh99

  security-advisories@github.com